Imagine a small cylinder with a dot at the top. Rotating the cylinder 1 degree clockwise of 0 degrees could signify a 1; and 1 degree anticlockwise of 0 degrees a zero. 0 degrees would be a space. Someone rotating one end of the cylinder would cause the other end of the cylinder to rotate instantly. Now imagine the cylinder extended to the length of one light year. Rotating one end of the cylinder would cause the other end to rotate instantly, yet a signal sent from the same end and travelling at the speed of light would take one year to arrive. This would be faster than light communication - or am I missing something really obvious?